CN109726604A - A kind of data exchange communications method contacted between card and terminal - Google Patents
A kind of data exchange communications method contacted between card and terminal Download PDFInfo
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Abstract
The present invention provides a kind of data exchange communications method contacted between card and terminal, is related to e-payment field；Contact card is contacted with terminal the following steps are included: S1, reads the essential information that level value obtains contact card by data receiver method；S2 judges whether it is reverse mode, and carries out data and receive process；S3 carries out judgement editing to data are had received.Data transmission procedure mainly comprises the steps that A1, into function is sent, obtains the data c to be sent of upper layer transport, determines the forward and reverse of sending mode；A2, drags down the level value of data line, and sets back off timer, carries out byte data transmission；A3, byte send parity check code after sending；The method according to the invention carries out standard operation, realizes the parsing of the reception to forward and reverse data and sends；Such mode should be readily appreciated that maintenance management, can execute extremely strong, and orderliness is clear, should be readily appreciated that and safeguards；It can fully ensure that the data interaction logic of links is realized.
Description
Technical field
The present invention relates to the data exchange communications sides between e-payment field more particularly to a kind of contact card and terminal
Method.
Background technique
In daily life, have smart card, the fiscard of contact function very common, the range of application is very extensive.With
And come, terminal how to realize with card communication flow? how to avoid it is excessively complicated, be difficult to the code system safeguarded? in the past
Processing mode be all that card-reading function is realized by configuring proprietary register using the special module inside main control processor.Or
The mode of the external independent card reading chip of person, master control pass through operational order and card reading chip communication.Both the above mode receive and
Aspect is sent all to close very much, the realization of bottom does not have compatibility, and portability is very poor, especially the processing mode of the latter, although
Operate relatively easy, but independent card reading chip will increase cost.
Therefore, it is necessary to design it is a kind of realize terminal and contact card between carry out transmitting-receiving byte method for interchanging data.
Summary of the invention
The purpose of the present invention is to provide a kind of data exchange communications methods between contact card and terminal, to solve existing
There are foregoing problems present in technology.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of data exchange communications method contacted between card and terminal, including data receiver method, the data receiver
Method includes the following steps
Contact card is contacted with terminal, reads the essential information that level value obtains contact card by S1；
S2 judges whether it is reverse mode, and carries out data and receive process；
S3 carries out judgement editing to data are had received.
Preferably, the step S1 specifically includes the following steps:
S11, the terminal starts timer A, and sets reception time-out time；
S12, the terminal operation reading external data line obtain level value, and whether decision level value is pulled low；If
It is then to enter step S14；If it is not, then entering step S13；
S13 judges whether timer A is overtime, if so, returning to mistake；If it is not, thening follow the steps S12, continue to obtain number
According to the level of line；
S14, when the DATA line of reading is low, start-up study waiting timer B simultaneously sets timing.
Preferably, the timing of the delay waiting timer B is 1.5etu.
Preferably, step S2 is mainly comprised the steps that
S21, determines whether current positive direction flag bit is set to reverse mode, if reverse mode, then executes S22,
If not reverse mode, thens follow the steps S24；
S22, initialization receive byte parity results ucParity, receive byte c and bit count value i, read external number
According to line, and current level value is obtained, when level value is low, then according to retrospectively calculate formula c+=(1 < < (7-i))；The number that will acquire
It is bit corresponding according to moving on to, while parity calculations ucParity^=1 is carried out, reset back off timer；If the level value is high,
The waiting time of back off timer is then directly set, return is re-read；
S23 after the byte data of step S22 receives completely, receives parity check code when bit count value i is greater than 8；
S24, initialization receive byte parity results ucParity, receive byte c and bit count value i, read external number
According to line, and current level value is obtained, when level value is low, then according to non-return calculation formula c+=(1 < < i)；The data that will acquire
It moves on to bit corresponding, while carrying out parity calculations ucParity^=1, reset back off timer；If the level value is high,
The waiting time of back off timer is directly set, return is re-read；
S25 after the byte data of step S24 receives completely, receives parity check code when bit count value i is greater than 8.
Preferably, it includes: to read the level state of current data line that step S23, which receives the process of check code, by this state
It is assigned to ucParityBit, if ucParityBit is equal to 0, ucParityBit and is assigned a value of 1, is otherwise assigned a value of 0；
The process that check code is received in step S25 includes reading the level state of current data line, this state assignment is given
Otherwise ucParityBit is assigned a value of 0 if ucParityBit is assigned a value of 1 not equal to 0, ucParityBit.
Preferably, step S3 is mainly comprised the steps that
S31 judges whether forward and reverse flag bit is initialization value, if it is not, then entering step S33；If then continuing to sentence
Determine whether the byte received in step S2 is 0x03, if then marking current reception pattern is reversed reception, receives simultaneously
To byte be assigned a value of 0x3F, ucParity^=1；If it is not, then entering step S32；
S32 determines whether received byte c is 0x3B, if forward and reverse flag bit g_stIccAtr.TS is set to
Otherwise 0x3B returns to error code, prompt to receive mistake；
S33 determines whether the parity check bit for receiving the byte is correct, returns if correct and receives byte c；If check code
It is incorrect, it prompts to receive mistake.
Preferably, the data exchange communications method further includes data transmission procedure, which mainly comprises the steps that
A1 obtains the data c to be sent of upper layer transport, determines the forward and reverse of sending mode into function is sent；
A2, drags down the level value of data line, and sets back off timer, carries out byte data transmission；
A3, byte send parity check code after sending.
Preferably, step A1 includes:
When the communication mode for determining current card is reverse mode, data step-by-step to be sent is negated by A11, and by result
It is assigned to bob；
A12, when determining that currently transmitted mode is forward mode, by byte indirect assignment to be sent to bob.
Preferably, step A2 includes:
A21, setting count value and count initialized value i is 0, determines i whether less than 8, if i value is thened follow the steps higher than 8
A24；If i value increases by 1 less than 8, the position i of byte bob to be sent is taken out according to formula bob& (1 < < i), judge the i whether
, if it is not, external data line is then set to low level, A23 is executed if so, executing A22 for height；
External DATA line by ucParityBit mark from increasing 1, and is set to high level by A22；
Whether A23 sets back off timer, waits 1 etu time, continue to judge i value less than 8；
A24 is calculated by formula ucSendBit=ucParityBit mod 2, by a digital-to-analogue 2 of byte bit 1 to be sent
As a result it is assigned to ucSendBit.
A25 determines whether currently transmitted mode is reverse mode, determines whether ucSendBit is equal to 1
Preferably, step A3 includes:
DATA line level is set to ucSendBit record value, sets the back off timer waiting time by A31；
A32 sets IO as input pattern, concurrently sets back off timer, waits 1 etu；
A33 reads DATA line, whether low by OK a karaoke club the IO level value is inquired, if then returning to transmission successful result, otherwise
Send failure.
The beneficial effects of the present invention are:
The present invention provides a kind of data exchange communications method realized between contact card and terminal, and master control controls number using IO
According to send and receive, the method according to the invention carry out standard operation, realize the reception to forward and reverse data parsing and hair
It send.Such mode should be readily appreciated that maintenance management, can execute extremely strong, and orderliness is clear, should be readily appreciated that and safeguards.It can fully ensure that
The data interaction logic of links is realized.
Detailed description of the invention
Fig. 1 is documented data receiver process of analysis in embodiment 1；
Fig. 2 is that documented data send process of analysis in embodiment 2.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing, to the present invention into
Row is further described.It should be appreciated that the specific embodiments described herein are only used to explain the present invention, it is not used to
Limit the present invention.
Explanation of nouns:
Etu: basic time unit (Elementary Time Unit)；
UcParity, ucParityBit, g_stIccAtr.TS, c, bob, ucSendBit, i are name variables, can be with
It is replaced；
DATA line: i.e. input/output (I/O) in 7816 agreements；
IO:DATA line is all the data channel of statement；
Embodiment 1
Contact card and the DRP data reception process in the data communications method of terminal, such as Fig. 1 are utilized the present embodiment provides a kind of
It is shown, realize that the process of bottom layer treatment reception data is as follows according to communication protocol:
1. terminal starts timer 1, the time-out time of 1 receive process of timer is set；
2. terminal operation reads external DATA line, current level value is obtained；Whether the level of judgement at this time is low by OK a karaoke club, if
Otherwise 3 are executed, if so then execute 5；
3. judging whether timer 1 is overtime, if so then execute 4, if otherwise executing 2, continue the electricity for reading external DATA line
It is flat；
4. returning to time-out error；
5. starting timer 2 when the DATA line of reading is low, the timer is set as the waiting timer that is delayed.Setting
Timing is 1.5etu；
6. determining that (flag bit can power on current positive direction flag bit g_stIccAtr.TS starting the first secondary card
When be initialized as 0xFF) whether be not set to reverse mode, to i.e. g_stIccAtr.TS！=0x3F executes 7 if setting up,
Otherwise 19 are executed；
7. it is that tri- values of count value i are 0 that initialization, which receives byte parity results ucParity, reception byte c, bit,；
8. judging that i whether less than 8, that is, judges whether count value is greater than a byte length, if so then execute 9；Otherwise it holds
Row 14；
9.i value adds 1 automatically；
It is 1 bit of IC card data by current level 10. reading the level of external DATA line；
11. determining whether the level is height, if so then execute 12, otherwise executes 13；
12. data bit1 is moved to right i according to positive calculation formula result c+=(1 < < i), and by the result after displacement
It does and merges with record value c before, indicate to record currently received bit, while calculating ucParity^=1；It calculates simultaneously
Received bit be 1 data bit exclusive or and result is saved in ucParity；
13. setting 2 waiting time of back off timer as 1etu, returns to 8 and execute；
14. setting back off timer 2, the waiting time is set as 1etu；
15. reading the level state of current DATA line；By this state assignment to ucParityBit；
Whether 16.ucParityBit is not equal to 0, executes 17 if meeting, otherwise executes 18；
17.ucParityBit is assigned a value of 1, executes 31；
18.ucParityBit is assigned a value of 0；
19. if initialization receives byte parity results ucParity, receives byte c, ratio current mode is reverse mode
It is 0 specially for count value i tri- values；
20. whether judge i less than 8, that is, judge count value whether less than one byte length, if so then execute 21, otherwise
Execute 26；
21.i value is automatic to add 1；
It 22. reading the level of external DATA line, and is to be saved using state as received 1 bit；
23. determining whether the level is low；If so then execute 24,25 are otherwise executed；
24. calculating c+=(1 < < (7-i)) according to retrospectively calculate formula；UcParity^=1；The data that will acquire move on to phase
The position bit answered, while carrying out parity calculations；
25. setting 2 waiting time of back off timer as 1etu, returns to 20 and execute；
26. setting back off timer 2, the waiting time is set as 1etu；
27. the level state of current DATA line is read, by this state assignment to ucParityBit；
Whether 28.ucParityBit is equal to 0, executes 29 if meeting, otherwise executes 30；
29.ucParityBit is assigned a value of 1, executes 29；
30.ucParityBit is assigned a value of 0；
31. determining whether forward and reverse flag bit is otherwise initial value 0xFF if so then execute 32 executes 34；
32. determining whether received byte c is 0x03, if so then execute 33, otherwise executes 34；
33. forward and reverse flag bit g_stIccAtr.TS is set to 0x3F, i.e., label currently receives to be reversed, while c assignment
For 0x3F, ucParity^=1,34 are executed；
34. determining whether received byte c is 0x3B, if so then execute 35, otherwise executes 38；
35. forward and reverse flag bit g_stIccAtr.TS is set to 0x3B；
36. determining whether the parity check bit for receiving the byte is correct, that is, judges ucParityBit！=ucParity is
No establishment executes 37 if setting up and otherwise executes 38；
Byte c is received 37. returning；
38. returning to error code, mistake is received.
Usual byte, which receives mistake, does not have corresponding error handle in the reception resolution logic of single byte.When wrong yardage
According to upper layer is returned to, the current operation mode of programmed decision can carry out corresponding fault-tolerant processing, processing according in different modes
Mode can correspond to one kind of following processing mode: reissue commands, lower electricity exit that operation, reset of card piece powers on reception data again.
Embodiment 2
The present embodiment provides a kind of methods that contact card carries out sending data with terminal, as shown in Fig. 2, advising according to agreement
Model send using IO and timer the atomic operation of data.Provided according to agreement, master control and IC card communication first
Instruction is the card returned data after terminal resets card.The data that terminal is returned by card can parse the letter of card release
Breath.I.e. before executing transmission, it is known that the communication mode of card is forward mode or reverse mode.
Data flow is sent 1. entering, byte c to be sent is passed to；
2. whether the communication mode for determining current card is reverse mode, sending mode is consistent with card communication mode,
Determine whether g_stIccAtr.TS is 0x3F；If otherwise executing 3, if so then execute 4；
3. setting sending mode as forward mode, byte c will be sent and be assigned to bob, execute 5；
4. negating data c step-by-step is sent, and result is assigned to bob；
5. DATA line is dragged down；
6. setting back off timer 2,1 etu time is waited；
7. setting count value i, initialization i is 0；
8. determining that i whether less than 8, if so then execute 9, otherwise executes 14；
9.i value increases by 1；
10. taking out the position i of byte bob to be sent by formula bob& (1 < < i), judge whether the position is high；If so then execute
11, otherwise execute 13；
11. by ucParityBit mark from increasing 1, and external DATA line is set to high level；
12. setting timer 2,1 etu time is waited, executes 8；
13. external DATA line is set to low level, 12 are executed；
14. being calculated by formula ucSendBit=ucParityBit mod 2, by a digital-to-analogue 2 of byte bit 1 to be sent
As a result it is assigned to ucSendBit；
15. determining whether currently transmitted mode is reverse mode, i.e. whether judgement g_stIccAtr.TS is 0x3F；If
16 are then executed, otherwise executes 19；
16. determining whether ucSendBit is equal to 1,18 are otherwise executed if so then execute 17；
17.ucSendBit=0；Execute 22；
18.ucSendBit=1；Execute 22；
19. determining whether ucSendBit is equal to 1,21 are otherwise executed if so then execute 20；
20.ucSendBit=1；Execute 22；
21.ucSendBit=0；Execute 22；
22. being set to DATA line level for ucSendBit record value；
23. setting timer B, 1 etu time is waited；
24. setting IO as input pattern；
25. setting timer B, 1 etu time is waited；
26. reading DATA line, whether low by OK a karaoke club the IO is inquired.If so then execute 27,28 are otherwise executed；
Successful result is sent 27. returning；
Failure result is sent 28. returning.
Usual byte, which receives mistake, does not have corresponding error handle in the reception resolution logic of single byte.When wrong yardage
According to upper layer is returned to, the current operation mode of programmed decision can carry out corresponding fault-tolerant processing, processing according in different modes
Mode can correspond to one kind of following processing mode: reissue commands, lower electricity exit that operation, reset of card piece powers on reception data again.
By using above-mentioned technical proposal disclosed by the invention, following beneficial effect has been obtained:
The present invention provides a kind of data exchange communications method realized between contact card and terminal, and master control controls number using IO
According to send and receive, the method according to the invention carry out standard operation, realize the reception to forward and reverse data parsing and hair
It send.Such mode should be readily appreciated that maintenance management, can execute extremely strong, and orderliness is clear, should be readily appreciated that and safeguards.It can fully ensure that
The data interaction logic of links is realized.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
Depending on protection scope of the present invention.
Claims (10)
1. a kind of data exchange communications method between contact card and terminal, which is characterized in that described including data receiver method
Data receiver method the following steps are included:
Contact card is contacted with terminal, reads the essential information that level value obtains contact card by S1；
S2 judges whether data receiver mode is reverse mode, and carries out data and receive process；
S3 carries out judgement editing to data are had received.
2. data exchange communications method according to claim 1, which is characterized in that the step S1 specifically includes following step
It is rapid:
S11, the terminal starts timer A, and sets reception time-out time；
S12, the terminal operation reading external data line obtain level value, and whether decision level value is pulled low；If so,
Enter step S14；If it is not, then entering step S13；
S13 judges whether timer A is overtime, if so, returning to mistake；If it is not, thening follow the steps S12, continue to obtain data line
Level；
S14, when the DATA line of reading is low, start-up study waiting timer B simultaneously sets timing.
3. data exchange communications method according to claim 2, which is characterized in that the delay waiting timer B's determines
When the time be 1.5etu.
4. data exchange communications method according to claim 1, which is characterized in that step S2 is mainly comprised the steps that
S21, determines whether current positive direction flag bit is set to reverse mode, if reverse mode, then executes S22, if not
It is reverse mode, thens follow the steps S24；
S22, initialization receive byte parity results ucParity, receive byte c and bit count value i, reading external data line,
And current level value is obtained, when level value is low, then according to retrospectively calculate formula c+=(1 < < (7-i))；The data that will acquire move on to
It is bit corresponding, while parity calculations ucParity^=1 is carried out, reset back off timer；If the level value is high, directly
The waiting time of back off timer is set, return is re-read；
S23 after the byte data of step S22 receives completely, receives parity check code when bit count value i is greater than 8；
S24, initialization receive byte parity results ucParity, receive byte c and bit count value i, reading external data line,
And current level value is obtained, when level value is low, then according to non-return calculation formula c+=(1 < < i)；The data that will acquire move on to phase
The position bit answered, while parity calculations ucParity^=1 is carried out, reset back off timer；If the level value is high, directly set
Determine the waiting time of back off timer, return is re-read；
S25 after the byte data of step S24 receives completely, receives parity check code when bit count value i is greater than 8.
5. data exchange communications method according to claim 4, which is characterized in that the process of step S23 reception check code
It include: the level state for reading current data line, by this state assignment to ucParityBit, if ucParityBit is equal to 0,
UcParityBit is assigned a value of 1, is otherwise assigned a value of 0；
The process that check code is received in step S25 includes reading the level state of current data line, this state assignment is given
Otherwise ucParityBit is assigned a value of 0 if ucParityBit is assigned a value of 1 not equal to 0, ucParityBit.
6. data exchange communications method according to claim 1, which is characterized in that step S3 is mainly comprised the steps that
S31 judges whether forward and reverse flag bit is initialization value, if it is not, then entering step S33；If then continuing to determine step
Whether the byte received in rapid S2 is 0x03, if then marking current reception pattern is reversed reception, while receiving
Byte is assigned a value of 0x3F, ucParity^=1；If it is not, then entering step S32；
S32 determines whether received byte c is 0x3B, no if forward and reverse flag bit g_stIccAtr.TS is set to 0x3B
Error code is then returned, prompts to receive mistake；
S33 determines whether the parity check bit for receiving the byte is correct, returns if correct and receives byte c；If check code is not just
It is true then prompt receive mistake.
7. data exchange communications method according to claim 1, which is characterized in that the data exchange communications method is also wrapped
Data transmission procedure is included, which mainly comprises the steps that
A1 obtains the data c to be sent of upper layer transport, determines the forward and reverse of sending mode into function is sent；
A2, drags down the level value of data line, and sets back off timer, carries out byte data transmission；
A3, byte send parity check code after sending.
8. data exchange communications method according to claim 7, which is characterized in that step A1 includes:
When the communication mode for determining current card is reverse mode, data step-by-step to be sent is negated by A11, and by result assignment
To bob；
A12, when determining that currently transmitted mode is forward mode, by byte indirect assignment to be sent to bob.
9. data exchange communications method according to claim 7, which is characterized in that step A2 includes:
A21, setting count value and count initialized value i is 0, determines i whether less than 8, if i value thens follow the steps A24 higher than 8；
If i value increases by 1 less than 8, the position i of byte bob to be sent is taken out according to formula bob& (1 < < i), judge the i whether be
Height, if it is not, external data line is then set to low level, executes A23 if so, executing A22；
External DATA line by ucParityBit mark from increasing 1, and is set to high level by A22；
Whether A23 sets back off timer, waits 1 etu time, continue to judge i value less than 8；
A24 is calculated by formula ucSendBit=ucParityBit mod 2, by 2 result of a digital-to-analogue of byte bit 1 to be sent
It is assigned to ucSendBit.
A25 determines whether currently transmitted mode is reverse mode, determines whether ucSendBit is equal to 1
10. according to right to go 7 described in data exchange communications method, which is characterized in that step A3 includes:
DATA line level is set to ucSendBit record value, sets the back off timer waiting time by A31；
A32 sets IO as input pattern, concurrently sets back off timer, waits 1 etu；
A33 reads DATA line, and whether inquire the IO level value low by OK a karaoke club, if then returning to transmission successful result, otherwise sends
Failure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110838204A (en) * | 2019-11-05 | 2020-02-25 | 艾体威尔电子技术(北京)有限公司 | Decoding method for magnetic stripe card swiping terminal |
| CN113064845A (en) * | 2021-04-28 | 2021-07-02 | 晶澄微电子(宁波)有限公司 | Method for realizing single-wire communication with anti-counterfeiting security chip |
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| CN101587533B (en) * | 2009-03-31 | 2011-05-18 | 北京飞天诚信科技有限公司 | Card reader and card reading method thereof |
| CN102546107B (en) * | 2011-12-28 | 2015-04-22 | 北京握奇数据系统有限公司 | Method, system and adapter card for data transmission between contact card and card reading device |
| CN103095811B (en) * | 2012-12-28 | 2016-12-28 | 北京大唐智能卡技术有限公司 | A kind of realize the mutual termination of information and method with CPU card |
| CN106127084B (en) * | 2016-06-21 | 2018-09-25 | 飞天诚信科技股份有限公司 | A kind of working method of financial terminal, safe processor and safe processor |
| CN110838204B (en) * | 2019-11-05 | 2021-04-13 | 艾体威尔电子技术(北京)有限公司 | Decoding method for magnetic stripe card swiping terminal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110838204A (en) * | 2019-11-05 | 2020-02-25 | 艾体威尔电子技术(北京)有限公司 | Decoding method for magnetic stripe card swiping terminal |
| CN113064845A (en) * | 2021-04-28 | 2021-07-02 | 晶澄微电子(宁波)有限公司 | Method for realizing single-wire communication with anti-counterfeiting security chip |
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